Notes/src/public/app/widgets/dialogs/options/text_notes.js

import server from "../../../services/server.js";

const TPL = `
<p><strong>Settings on this options tab are saved automatically after each change.</strong></p>

<form>
    <h4>Heading style</h4>
    <select class="form-control" id="heading-style">
        <option value="plain">Plain</option>
        <option value="underline">Underline</option>
        <option value="markdown">Markdown-style</option>
    </select>
    
    <br/>
    
    <h4>Table of contents</h4>
    
    Table of contents will appear in text notes when the note has more than a defined number of headings. You can customize this number:
    
    <div class="form-group">
        <input type="number" class="form-control" id="min-toc-headings" min="0" max="9999999999999999" step="1" style="text-align: right;"/>
    </div>
    
    <p>You can also use this option to effectively disable TOC by setting a very high number.</p>
</form>`;

export default class TextNotesOptions {
    constructor() {
        $("#options-text-notes").html(TPL);

        this.$body = $("body");

        this.$headingStyle = $("#heading-style");
        this.$headingStyle.on('change', () => {
            const newHeadingStyle = this.$headingStyle.val();

            this.toggleBodyClass("heading-style-", newHeadingStyle);

            server.put('options/headingStyle/' + newHeadingStyle);
        });

        this.$minTocHeadings = $("#min-toc-headings");
        this.$minTocHeadings.on('change', () => {
            const minTocHeadings = this.$minTocHeadings.val();

            server.put('options/minTocHeadings/' + minTocHeadings);
        });
    }

    toggleBodyClass(prefix, value) {
        for (const clazz of Array.from(this.$body[0].classList)) { // create copy to safely iterate over while removing classes
            if (clazz.startsWith(prefix)) {
                this.$body.removeClass(clazz);
            }
        }

        this.$body.addClass(prefix + value);
    }

    async optionsLoaded(options) {
        this.$headingStyle.val(options.headingStyle);
        this.$minTocHeadings.val(options.minTocHeadings);
    }
}